How To Fix WL150 - Invalid ABAP type when passing expression &

SAP Error Message - Details

• Message type: E = Error

• Message class: WL - Workflow: run-time messages

• Message number: 150

• Message text: Invalid ABAP type when passing expression &

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message WL150 - Invalid ABAP type when passing expression & ?

  The SAP error message WL150 "Invalid ABAP type when passing expression &" typically occurs when there is an issue with the data type of a variable or expression being used in an ABAP program. This error can arise in various contexts, such as when calling function modules, methods, or when passing parameters.
  Causes:
  
  Incorrect Data Type: The variable or expression being passed does not match the expected data type of the parameter in the function module or method.
  Uninitialized Variables: If a variable is not properly initialized or declared, it may lead to this error.
  Incompatible Structures: If you are trying to pass a structure or table that does not conform to the expected structure or table type.
  Dynamic Typing Issues: If you are using dynamic programming techniques (like FIELD-SYMBOLS or DATA with TYPE), the type may not be correctly defined or resolved at runtime.
  
  Solutions:
  
  Check Data Types: Ensure that the data types of the variables you are passing match the expected types in the function module or method signature. Use the ABAP Data Dictionary to verify the expected types.
  Initialize Variables: Make sure that all variables are properly initialized before they are used in expressions or passed as parameters.
  Use Correct Structures: If you are passing structures or tables, ensure that they are defined correctly and match the expected structure in the called function or method.
  Debugging: Use the ABAP debugger to inspect the values and types of the variables at runtime. This can help identify where the type mismatch is occurring.
  Type Casting: If necessary, use type casting to convert the variable to the expected type before passing it.
  
  Related Information:
  
  ABAP Data Types: Familiarize yourself with the different ABAP data types (e.g., elementary types, complex types, reference types) and their usage.
  Function Module Documentation: Review the documentation for the function module or method you are calling to understand the expected parameter types.
  ABAP Development Guidelines: Follow best practices for ABAP development, including proper variable declaration and initialization.
  
  If you continue to encounter issues, consider providing the specific code snippet that is causing the error for more targeted assistance.